<style>
body {
  font-family:monospace; font-size:12px; line-height:20px; text-align:center;
  background:white;
}
.div_error {
  background:lightblue; border:skyblue 1px solid; width:900px;
  margin-left:auto; margin-right:auto; margin-top:20px; margin-bottom:100px;
}
.div_error_inner {
  margin:10px; text-align:left;
}
</style>

<div class="div_error">
<div class="div_error_inner">

Error:<br>
<b>##error_msg##</b>
<div>&nbsp;</div>

Debug backtrace:<br>
##debug_backtrace##

</div>
</div>